Sometimes gently pushing in the trip odometer reset with get it to start working, but if it does, it will only be temporarily.
From my experience it is a little white gear mounted on a small metal shaft that has moved away from the worm gear that it engages with.
The shaft is held in place on the opposite end by the black plastic speedo housing. It looks like that over the 200k miles of use the end of the the metal shaft has worn into the black plastic allowing it to move into the housing and thus creating just enough room for the little white gear to become disengaged.
I have experienced the same problem with the 190E. I have had it out and tried multiple times to fix it. The car has 220k miles on it so it seems this is very common.
A local speedo shop quotes $145 to overhaul it. I am going to have to take it there eventually because the shaft continues to want to walk out of the housing. I did on the last repair install an ultra small washer that covered the end of the shaft and secured it using a small dab of gel super glue. I then tested it to make sure it rotated and then carefully added a dab of light lubricant under the tiny washer.
Hope this helps,
Haasman
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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
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